Summa Theologica by St. Thomas Aquinas
FP: Treatise On Man
Q[87] How The Intellectual Soul Knows Itself And All Within Itself
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We have now to consider how the intellectual soul knows itself and all within itself. Under this head there are four points of inquiry:

A[1] Whether the soul knows itself by its own essence?

A[2] Whether it knows its own habits?

A[3] How does the intellect know its own act?

A[4] How does it know the act of the will?